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| SY89858U Precision Low Power 1:8 LVPECL Fanout Buffer with Internal Termination General Description The SY89858U is a 2.5V/3.3V precision, highspeed, fully differential LVPECL 1:8 fanout buffer optimized to provide eight identical output copies with less than 30ps of skew and less than 10pspp total jitter. It can process clock signals as fast as 2.0GHz. The differential input includes Micrel's unique, 3-pin input termination architecture that allows the SY89858U to directly interface to LVPECL, CML, and LVDS differential signals (AC- or DC-coupled) as small as 100mV without any level shifting or termination resistor networks in the signal path. The result is a clean, stub-free, low-jitter interface solution. The LVPECL (100k temperature compensated) outputs feature 800mV typical swing into 50 loads, and provide fast rise/fall times guaranteed to be less than 200ps. The SY89858U operates from a 2.5V 5% supply or 3.3V 10% supply and is guaranteed over the full industrial temperature range of -40C to +85C. For applications that require a higher speed fanout buffer, consider the SY58032U. The SY89858U is part of Micrel's high-speed, Precision EdgeTM product line. All support documentation can be found on Micrel's web site at: www.micrel.com. Precision EdgeTM Features * Precision 1:8, LVPECL fanout buffer * Low power: 238mW (2.5V) * Guaranteed AC performance over temperature and supply voltage: - Wide operating frequency: DC to 2.0GHz - <380ps In-to-Out tpd - <200ps tr/tf - <30ps skew * Ultra-low jitter design: - <1psrms random jitter - <1psrms cycle-to-cycle jitter - <10pspk-pk total jitter * 100k LVPECL compatible outputs * Fully differential inputs/outputs * Accepts an input signal as low as 100mV (200mVpp) * Unique patent pending input termination and VT pin accepts DC-coupled and AC-coupled differential inputs (LVPECL, LVDS, and CML) * Power supply 2.5V +5% or 3.3V +10% * -40C to +85C industrial temperature range * Available in 32-pin (5mm x 5mm) MLFTM package Applications * * * * All SONET and GigE clock distribution All Fibre Channel clock and data distribution Network routing engine timing distribution High-end, low-skew multiprocessor synchronous clock distribution Markets * * * * Precision Edge is a trademark of Micrel, Inc MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc. LAN/WAN Enterprise servers ATE Test and measurement November 2004 M9999-110804 hbwhelp@micrel.com or (408) 955-1690 Micrel SY89858U Typical Application 1:8 LVPECL FOB Q0 /Q0 Q1 /Q1 Q2 /Q2 IN 50 VT 50 /IN VREF-AC /Q3 Q4 /Q4 Q5 /Q5 Q6 /Q6 Q7 /Q7 Q3 November 2004 2 M9999-110504 hbwhelp@micrel.com or (408) 955-1690 Micrel SY89858U Ordering Information(1) Part Number Package Type MLF-32 MLF-32 Operating Range Industrial Industrial Package Marking Lead Finish NiPdAu Pb-Free NiPdAu Pb-Free SY89858UMG SY89858UMGTR(2) Notes: SY89858 with Pb-Free bar-line indicator SY89858 with Pb-Free bar-line indicator 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals Only. 2. Tape and Reel. Pin Configuration VCC Q0 /Q0 Q1 /Q1 Q2 /Q2 VCC VCC GND IN VT VREF-AC /IN GND VCC 1 2 3 4 5 6 7 8 32 3130 29 28 27 26 25 24 23 22 21 20 19 18 17 9 10 11 12 13 14 15 16 GND VCC Q3 /Q3 Q4 /Q4 VCC GND 32-Pin MLFTM (MLF-32) Pin Description Pin Number Pin Name Pin Function Differential Input: This differential input accepts AC- or DC-coupled signals as small as 100mV (200mVpp). Each pin of this pair internally terminates to a VT pin through 50 . Note that these inputs will default to an indeterminate state if left open. Please refer to the "Input Interface Applications" section for more details. Input Termination Center-Tap: Each side of the differential input pair terminates to this VT pin. The VT pin provides a center-tap to a termination network for maximum interface flexibility. See the "Input Interface Applications" section for more details. Reference Voltage: This output biases to VCC-1.2V (typical). It is used for ACcoupling inputs IN and /IN. Connect VREF-AC directly to the corresponding VT pin. Bypass with 0.01uF low ESR capacitor to VCC. Maximum sink/source capability is 1.5mA. Positive Power Supply: Bypass with 0.1F//0.01F low ESR capacitors as close to the VCC pins as possible. 100k LVPECL Differential Outputs: Differential buffered output copy of the input signal. The LVPECL output swing is typically 800mV into 50 to VCC-2V. Unused output pairs may be left floating with no impact on jitter. See "LVPECL Output" section. Ground: Ground pins and exposed pad must be connected to the same ground plane. 3, 6 IN, /IN 4 VT 5 VREF-AC 1, 8, 9, 16, 18, 23, 25, 32 31, 30, 29, 28, 27, 26, 22, 21, 20, 19, 15, 14, 13, 12, 11, 10 VCC Q0, /Q0, Q1, /Q1, Q2, /Q2, Q3, /Q3, Q4, /Q4, Q5, /Q5, Q6, /Q6, Q7, /Q7 GND Exposed Pad 2, 7, 17, 24 November 2004 VCC /Q7 Q7 /Q6 Q6 /Q5 Q5 VCC 3 M9999-110504 hbwhelp@micrel.com or (408) 955-1690 Micrel SY89858U Absolute Maximum Ratings(1) Supply Voltage (VCC)............................. -0.5V to +4.0V Input Voltage (VIN)..................................... -0.5V to VCC Termination Current Source or sink current on VT..................... 100mA Reference Current(3) Source or sink current on VREF-AC .............. 1.5mA LVPECL Output Current (IOUT) Continuous .................................................... 50mA Surge ........................................................... 100mA Lead Temperature (soldering, 20 sec.)............ +260C Storage Temperature (Ts) ...................-65C to 150C Operating Ratings(2) Supply Voltage (VCC) ....................+2.375V to +2.625V ........................................................ +3.0V to +3.6V Ambient Temperature (TA) .................. -40C to +85C Package Thermal Resistance(4) MLFTM ( JA) Still-Air ........................................................ 35C/W MLFTM ( JB) Junction-to-Board ...................................... 20C/W DC Electrical Characteristics(5) TA = -40C to +85C, unless otherwise stated. Symbol VCC ICC RIN RDIFF_IN VIH VIL VIN VDIFF_IN VT_IN VREF-AC Notes: 1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratings conditions for extended periods may affect device reliability. 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. Due to the limited drive capability use for input of the same package only. 4. Package Thermal Resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. JB values are determined for a 4-layer board in still air, unless otherwise stated. 5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 6. VIH (min) not lower than 1.2V. JA Parameter Power Supply Power Supply Current Input Resistance (IN-to-VT) Differential Input Resistance (IN-to-/IN) Input High Voltage (IN, /IN) Input Low Voltage (IN, /IN) Input Voltage Swing (IN, /IN) Differential Input Voltage Swing |IN-/IN| IN-to-VT (IN, /IN) Output Reference Voltage Condition Min 2.375 3.0 Typ 2.5 3.3 95 Max 2.625 3.6 150 55 110 VCC VIH-0.1 1.7 Units V V mA No load, max. VCC 45 90 Note 6 VCC -1.6 0 See Figure 1a. See Figure 1b. 0.1 0.2 50 100 V V V V 1.28 VCC-1.3V VCC-1.2V VCC-1.1V V V and November 2004 4 M9999-110504 hbwhelp@micrel.com or (408) 955-1690 Micrel SY89858U LVPECL Outputs DC Electrical Characteristics(7) VCC = 2.5V 5% or 3.3V 10%; TA = -40C to + 85C; RL = 50 Symbol VOH VOL VOUT VDIFF-OUT Note: 7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. to VCC -2V, unless otherwise stated. Min VCC-1.145 VCC-1.945 Typ Max VCC-0.895 VCC-1.695 800 1600 Units V V mV mV Parameter Output HIGH Voltage Q, /Q Output LOW Voltage Q, /Q Output Voltage Swing Q, /Q Differential Output Voltage Swing Q, /Q Condition See Figure 1a. See Figure 1b. 500 1000 AC Electrical Characteristics(8) VCC = 2.5V 5% or 3.3V 10%; TA = -40C to + 85C, RL = 50 Symbol fMAX tPD Tpd Tempco Tskew Parameter Maximum Operating Frequency Propagation Delay (IN-to-Q) Differential Propagation Delay Temperature Coefficient Output-to-Output Skew Part-to-Part Skew Random Jitter (RJ) tJitter Deterministic Jitter (DJ) Cycle-to-Cycle Jitter Total Jitter tR, tF Notes: 8. 9. High-frequency AC-parameters are guaranteed by design and characterization. Output-to-output skew is measured between outputs under identical conditions. to VCC -2V, unless otherwise stated. Min 2.0 180 Typ 3.0 260 115 380 Max Units GHz ps fs/oC 30 150 1 10 1 10 75 130 200 ps ps(rms) ps(pp) ps(pp) ps(pp) ps Condition VOUT 400mV Note 9 Note 10 Note 11 Note 12 Note 13 Note 14 At full output swing. Output Rise/Fall Time (20% to 80%) 10. Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and with no skew of the edges at the respective inputs. Part-to-part skew includes variation in tpd. 11. Random jitter is measured with a K28.7 character pattern, measured at 2.5Gbps. 12. Deterministic Jitter is measured at 2.5Gbps, with both K28.5 and 223 - 1 PRBS pattern. 13. Cycle-to-cycle jitter definition: The variation of periods between adjacent cycles, Tn - Tn-1 where T is the time between rising edges of the output signal. 14. Total jitter definition: With an ideal clock input of frequency 5 M9999-110504 hbwhelp@micrel.com or (408) 955-1690 Micrel SY89858U Typical Operating Characteristics 900 800 Output Swing vs. Frequency PROPAGATION DELAY (ps) 270 265 260 255 250 245 240 0 Propagation Delay vs. Input Swing OUTPUT SWING (mV) 700 600 500 400 300 200 100 0 1000 1500 2000 2500 3000 3500 4000 4500 500 200 400 600 800 1000 0 INPUT SWING (mV) FREQUENCY (MHz) Functional Characteristics 200MHz Clock 622MHz Clock Output Swing (150mV/div.) TIME (750ps/div.) Output Swing (150mV/div.) TIME (200ps/div.) 1.5GHz Clock 2.5GHz Clock Output Swing (150mV/div.) TIME (150ps/div.) Output Swing (150mV/div.) TIME (100ps/div.) November 2004 6 M9999-110504 hbwhelp@micrel.com or (408) 955-1690 Micrel SY89858U Singled-Ended and Differential Swings VDIFF_IN, VDIFF_OUT 1600mV (typical) VIN, VOUT 800mV (typical) Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing Timing Diagram /IN VIN IN tpd /Q VOUT Q tpd Input and Output Stages VCC VCC IN 50 VT 50 /IN GND /Q Q Figure 2a. Simplified Differential Input Stage Figure 2b. Simplified LVPECL Output Stage November 2004 7 M9999-110504 hbwhelp@micrel.com or (408) 955-1690 Micrel SY89858U Input Interface Applications VCC VCC VCC IN IN LVPECL LVPECL IN CML SY89858U VCC GND RP 0.1F /IN SY89858U VT NC VREF-AC Note: For 3.3V, RP = 50. For 2.5V, RP = 19. /IN RP GND GND RP VCC 0.1F VT VREF-AC For 3.3V, RP = 100. For 2.5V, RP = 50. /IN SY89858U GND NC NC VT VREF-AC Option: may connect VT to VCC Figure 3c. CML Interface (DC-Coupled) VCC Figure 3a. LVPECL Interface (DC-Coupled) VCC Figure 3b. LVPECL Interface (AC-Coupled) VCC IN CML /IN VCC 0.01F VT VREF-AC SY89858U IN LVDS /IN SY89858U IN LVDS /IN SY89858U GND VCC VT GND GND NC NC VT VREF-AC VREF-AC 0.01F Figure 3d. CML Interface (AC-Coupled) Figure 3e. LVDS Interface (DC-Coupled) Figure 3f. LVDS Interface (AC-Coupled) November 2004 8 M9999-110504 hbwhelp@micrel.com or (408) 955-1690 Micrel SY89858U LVPECL Output Interface Applications LVPECL has high input impedance, and very low output impedance (open emitter), and small signal swing which results in low EMI. LVPECL is ideal for driving 50 and 100 controlled impedance transmission lines. There are several techniques for terminating the LVPECL output: Parallel Termination-Thevenin Equivalent, Parallel Termination (3-resistor), and AC-coupled Termination. Unused output pairs may be left floating. However, single-ended outputs must be terminated, or balanced. +3.3V +3.3V ZO = 50 ZO = 50 R1 130 R1 130 +3.3V For +2.5V systems, R1 = 250, R2 = 62.5 R2 82 R2 82 VT = VCC --2V Figure 4a. Parallel Termination-Thevenin Equivalent +3.3V Z = 50 Z = 50 50 50 Rb +3.3V "source" "destination" VCC C1 (optional) Notes: 0.01F 1. Power-saving alternative to Thevenin termination. 2. Place termination resistors as close to destination inputs as possible. 3. Rb resistor sets the DC bias voltage, equal to VT. 4. For 2.5V systems, Rb = 19, For 3.3V systems, Rb = 50 Figure 4b. Parallel Termination (3-Resistor) Related Product and Support Documentation Part Number SY58032U Function Ultra-Precision 1:8 LVPECL Fanout Buffer w/Internal Termination MLFTM Application Note HBW Solutions New Products and Applications Data Sheet Link www.micrel.com/product-info/products/sy58032u.shtml www.amkor.com/products/notes_papers/MLFAppNote.pdf www.micrel.com/product-info/products/solutions.shtml November 2004 9 M9999-110504 hbwhelp@micrel.com or (408) 955-1690 Micrel SY89858U 32 Lead MicroLeadFrameTM (MLF-32) Package Notes: 1. 2. 3. Package meets Level 2 Moisture Sensitivity Classification. All parts are dry-packaged before shipment. Exposed pad must be soldered to a ground for proper thermal management. MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated. November 2004 10 M9999-110504 hbwhelp@micrel.com or (408) 955-1690 |
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